Centrifugal air or gas moving or forcing apparatus.



' W. G. HAY. CENTRIFUGAL AIR 0R GAS MOVING 0R FORCING APPARATUS. APPLICATION FILED FEB. p5. 1915.

1,160,076. Patented Nov. 9, 1915. v

2 SHEETS'SHEET FIG.

'w e. HAY. CENTRIFUGAL MR 0R GAS MOVING 0R FORCING APPARATUS.

APPLICATION FILED FEB. 15. I915.

Patentd Nov. 9, 191*.

2 SHEETS-SHEET 2- efl y wir /9.519

UNITED STATES PATENT orrrcE.

WILLIAM GEORGE HAY, OF PRESTWIC H, ENGLAND.

CENTRIFUGAL AIR OR GAS MOVING 0R FORCING APPARATUS.

Specification of Letters Patent.

Patented Nov. 9,1915.

Application filed February 1915. Serial No. 8,419.

' or compressing means consists of centrifugal Wheels or impellers, into which the air is drawn, and from the periphery of which it is discharged centrifugally.

The invention consists in general of certain novel details of construction and combination of parts hereinafter fully described, illustrated in the accompanying drawings, and specifically claimed.

In the accompanying drawings like characters of reference indicate like parts in the several views, and Figure 1' is a vertical section taken through an apparatus constructed in accordance with this invention. Fig. 2 is a horizontal section taken through such an apparatus, a portion of the same being broken away. Fig. 3 is. a detail section taken vertically through the apparatus near the periphery.

Referringto the drawings, there is employed in the centrifugal air or other gas moving means shown, a plurality of centrifugal wheels or impellers, generally marked 1, through which the air or gas is moved by centrifugal forces in succession; the air being introduced first into the eye 2 of the upper impeller, and thence in series 7 through the others beneath it; so that whether the apparatus be used for exhausting a space or chamber or for compressing air or gases, the pressure in the successive wheels or impellers and stages of movement, will be successively higher. a

The impellers or wheels aredisposed and operate within casings 3 which are'separate from one another, and 1n the case shown are castings; and they are all mounted on the common shaft 4, which is supported at the upper and lower ends by ball bearings 5, carried in the bearing boxes 6; the upper one of which lies within the casing 7 ,which constitutes the intake conduit and chamber for the air or gas'to the pump o'r forcing apparatus, and with which the annular eye or intake of the first impeller or wheel 1 ably fastened by rings on' to the top or bottom of the boss 10, from which place they are lnclined toward one another to the discharge orifice part 14, which is inthe form of a restricted annular discharge orifice or mouth, the lips of which are placed close together as shown; and these two plates 13 may be held together, and kept apart at the required distance, in any known suitable way.

Directly opposite, and in the same plane as the annular mouth 14, is a discharge passage 15 in the casing 3, one part of which is formed by the cast metal of the casing, as shown; while the other part 16 is formed of a sheet metal plate which extends up from below, and is bent over at its upper part so as to make the inner side of the passage 15,

at this part, complementary to the wall at the other side of this passage; and the central horizontal planeof the impeller 1 will lie centrally between these two walls of the passage 15 where the air enters it, as it is flung offcentrifugally from the mouth 14 of the impeller.

By this form and construction of parts, the air or gas is centrifugally forced and de-' livered into the passage 15, without abnormal heating and waste of power, eddies, and like actions; and the'air or gas passes from the passage or port 15 into a plurality of separate conduits 18 formed between the bottom of the casing 3, and a sheet metal diaphragm 19 fixed between flanges 20 of vthe casing .3 at its periphery. The separat ing walls 22 of the passages are formed on the bottom ofthe metal casing which sepapassage 15 are in theform of tangential curves; andthe inner parts of which are. straight, their ends terminating in portions eccentric'to the axis ofthe machine as shown points; and it'is provided with a plurality of openings 24 in the part lying between the annular directing or guide plate 16, and the outer portion of the passage or port 15, the outer part of which is of. convex form. These apertures 24 are formed in the plate 19 by stamping out semi-disks or louvers 25, which are cut around the semi-circular edge, and are pressed up so as to stand at the angle shown' in Fig. 3; and these parts 25 face the direction of flow of the air or gas, so that the-louvers .25 direct and guide the air or gas smoothly from this annular port 15 into the passages or spaces 21 below the plate 19. The air or gas is thus guided and controlled from the tips of the lips 14 of the impellers, to-the eye of the impeller next in series; and above theveye, the plate 19 is curved around as shown; while in the bottom of the eye there is a curved plate to direct the air into the tubes 12, so that sharp angles and bends, and eddying of the air, and loss of efliciency, are obviated.

Beyond the final impeller wheel, the air or gas is conducted through curved annular passage 15, and the openings 24 in the plate 19, into an annular chamber 26 at the outer part of the casing; and on this chamber the outlet branch 27 is fitted, a plate 28 being placed across the chamber 26 as seenin Fig.

3, where the outlet 27 comes, to direct the air from the chamber to the discharge branch 27. I

In the air impeller or moving apparatus shown in the drawings, the shaft 4: has a belt wheel or pulley 29 upon it, by which it is driven from a motor or any source of power.

The hubs 10 at their upper sides project and enter the opening in the direction u plates of the casings 3, with which they make a working fit, so as to prevent theintake of air from the space in the case 3,'

outside the disks 13.

In some cases, a singlewheel air or gas moving or compressing apparatus. may be employed, in which case the Wheel referred to may be disposed within a correspondingly shaped stationary casing lying within-the main casing, having an annular discharge conduit in the same plane as, and outside the annular discharge mouth of the wheel.

By havingthe annular discharge mouth 14 comparatively narrow as described, and

by the construction described, besides eddies, and loss of efliciency by. heating the air being avoided, noise or whistling is avoided. This.

construction also prevents the leakage of air backto the inlet pr eye of the impellers of the impeller. (1

from the space above and below the disks 13 of the Wheels 1, which otherwise might take place.

By this invention a multiple centrifugal impeller gas forcing apparatus is devised which will cause a continuous flow from the inlet to the outlet.

2. In an apparatus of the character de scribed, an impeller comprising a hollowhub and tubular outlet arms extending therefrom and constructed to deliver fluid in a radial direction, said arms having their inlet openings substantiallycircular and their outlet openlngs na-rrower' in one direction and wider in a direction normal thereto than the diameter of the inlet openings, the longer dimensions of said outlet openings lying in a plane at right angles to the axis 3. In an apparatus of the character described, the combination with an impeller comprising a hollow hub and tubular outlet arms .extendin therefrom and constructed to deliver flui in a radial direction, said arms having their inlet openings substantially circular and their outlet openings narrower in one direction. and wider in a direction normal thereto than the diameter of the inlet openings of a delivery conduit provided with a narrow discharge passage extending in a direction parallel to the longer dimensions .of said outlet openings.

4; In an apparatus of the character described, the combination with an impeller comprising a hollow hub and tubular outlet arms extending therefrom and constructed to deliver fluid in a radial direction, said arms having their inleto'penings substan-. tially circular and their outletopenings narrower in one direction and wider in'a direction normal thereto than the diameter of said outlt openings lying in a plane at right angles to the axis of the'impeller, of a'delivery conduit provided with a narrow discharge. passage extending in a direction parallel to the longer dimensions of said Outlet openings. 1

' 5. In a device of the character described, the combination with a circular casing having a peripheral guide wall and a plate transverse to its axis forming one side of it,

.the inlet openings, the longer dimensions of of an annular guide plate within said .cas-

ing and spaced from said guide wall, the peripheral portion of-said transverse plate ripheral being providedwith a series of struck up portions arrangedbetween said guide wall and guide plate whereby outlet openings in said transverse plate are provided and an impeller revoluble in the casing and comprising a hollow hub having an inlet opening and a plurality of radial tubular arms provided with outlet openings arranged in alinement with the space between the guide wall of the'casing and the upper edge of the guide plate.

6. In an apparatus of the character described, a casing comprising a plurality of chambers each having a central opening in its upper part, an impeller revolubly mounted in each chamber, a transverse plate in each chamber beneath the impeller, the periphery of the said transverse plate provided with a plurality of struck up portions providing escape openings, the peripheral wall of each chamber forming a guide wall and an annular guide plate arranged in spaced relation to the guide wall.

' 7. In a device of the character described, a casing comprising a plurality of chambers having circular end walls providing a peripheral guide wall, and a plate in each 1 chamber transverse to its axis and forming one side of the chamber, in combination with an annular guide plate within each chamber and spaced from the guide wall thereof, the

peripheral portion of each transverse plate belng provided with a series of struck up portions arranged between the said guide wall and guide plate whereby outlet openings in said transverse plate are provided, and an impeller revolubly mounted in each chamber, and comprising a hollow hub having an inlet opening and a plurality of radial tubular arms provided with outlet openings arranged in alinement with the space between the guide wall of each chamber and the upper edge of the guide plate.

8. In a device of the character described, a casing comprising a plurality of chambers having circularv end Walls providing a peguide wall and a plate in each chamber transverse to its axis and forming one side of the chamber, in combination with an annular guide plate within each chamber and spaced-from the guide wall thereof, the, peripheral portion of each transverse plate being provided with a series of struck up portions arranged between thesaid guide ,wall and guide-plate whereby outlet openings provided with deflection plates are provided, and an impeller revolubly mountrality of radial tubular arms provided with outlet openings arranged in alinement with 'the space between the guide wall of each chamber and the upper edge of the guide plate, each of the upper chambers beingfurther provided with guide ribs having curved outer ends to direct the air to the next casing below.

9. In an apparatus of the character described, a casing having a plurality of chambers, an impeller within each chamber, a transverse plate in each chamber below the impeller, the peripheral edge of each plate having a series of struck up portions providing means for conveying air from the discharge outlet of one impeller to the eye of the impeller next in series.

10. In an apparatus of the character described, the combination with an impeller comprising a hollow hub and tubular outlet arms extending therefrom and constructed to deliver fluid in a radial direction, said arms having their inlet openings substantially circular and their outlet openings narrower in one direction and wider in a drection normal thereto than the diameter of the inlet opening, of inclosing disks for the said tubular outlet arms, a slotted receiving passage carried bythe said disks and receiving the fluid discharged radially by the tubular arms.

11. In apparatus of the character described, a casing having a plurality of cham bers, an impeller having a plurality of radial tubes each of approximately equal area from the base to the end, and the spaces between the tubes-inclosed between plates so as tosubstantially prevent the passage of air between such space, a transverse plate in each chamber having at its outer part a plurality of openings for conveying air from the discharge ends of the tubes of one 1m peller to the eye of the impeller next in series, and theradial tubes leading from such eye, substantially as described.

In testimony whereof I havesigned my name to this specification in the presence of two subscribing witnesses.

WILLIAM GEORGE HAY. Witnesses LEVI COHEN, SOMERVILLE GOODALL. 

